Apple's iPhone Air sold out across online stores in China within hours of pre-orders opening on Friday, the South China Morning Post reports.

Apple Inc.’s iPhone Air went on sale in China on Wednesday, eliciting a subdued consumer response in the world’s biggest smartphone arena.

While Apple's China sales have been struggling, with its quarterly revenue in the region declining 4% year over year and coming in below estimates, Cook expects the new iPhone lineup to drive a return to growth in the region.

Fierce competition and supply constraints lead to a sales decline, but Apple’s boss says demand for newest iPhone series will spur a rebound.

Chinese startup Noetix Robotics has developed a humanoid robot priced lower than an iPhone by redesigning its components, structure, and production chain from the ground up.

According to a report from the South China Morning Post, the iPhone Air “sold out within minutes of its launch in China” earlier today. The report explains that “minutes after” pre-orders began on Friday morning, the iPhone Air was sold out “at all bricks-and-mortar stores in Beijing and Shanghai, as well as in cities like Tianjin.”

Apple stock is facing its next big test as the iPhone maker gears up to report earnings. The company just topped a $4 trillion valuation this week.

The latest iPhones have seen "a tremendous response" across the globe, said Apple boss Tim Cook as the tech giant released its latest financial results. The firm unveiled its thinnest iPhone, the Air,